.rui-mask-layer{
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1026;
}
.rui-mask-content{
  position: absolute;
  z-index: 1024;
}
.rui-center{
  top: 50%;
  left: 50%;
  transform: translate(-50%,-50%);
}
.rui-left{
  left: 0;
  top: 0;
  height: 100%;
}
.rui-right{
  right:0;
  top: 0;
  height: 100%;
}
.rui-top{
  top: 0;
  left: 0;
  width: 100%;
}
.rui-bottom{
  bottom: 0;
  left: 0;
  width: 100%;
}